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Boeckeler Instrument Co. Tucson, AZ & Trenton, MI - Inspection Table Scientific Corp. Rack & Pinion Precision Focus Adjustment Text taken from the patent 1,899,192 William Gaertner, February 28, 1933 "In microscopes, telescopes and other instruments in which focusing adjustments are required, a smooth, positive and precised adjustment of the draw tube is essential to satisfactory use and it is of great importance that there be no failure in any of these respects when such instruments are employed for scientific research and determinations. Optical instruments of various kinds have been provided with rack and pinion means for effecting focusing adjustments, but the mounting and operation of such means have not compared favorably with the minuteness of detail that characterizes the construction and assemble of the optical parts of the instrument. The principal object of the present invention is to provide an arragement and mounting of the means for manipulating the movement element of a longitudinally adjustable instrument or apparatus that will be firm, positive and permanent and still permit of the most delicate of adjustments. Another object is to improve the appearance of the device and to minimize the opportunity for even a slight disarrangement of the parts." (Boeckeler instrument co inspection table and gaertner is the responsibility of Debora Holman) |
D_Holman@cedar--rapids.com (Debora Holman) for more information.
